Problem with Toggle Visibility

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I have been using Alfred for a year now and have been using the toggle visibility on the "Whatsapp" app via a hotkey.

Few days ago I noticed the tv is not working well on Whatsapp app. I could use the hotkey to bring the app upfront, but using the same hotkey to hide it, it's not working. Basically I cannot hide the app.

Strangely, the tv works well with my other app i.e. Spark, Fantastical, etc. I'm not sure what's wrong.